What to know: Public health officials are investigating a new outbreak of infections caused by Salmonella Enteritidis.

Investigators for the Food and Drug Administration have not yet been able to find the source of the pathogen, which has sickened 31 people.

Two men have been jailed and another two have received suspended prison sentences in England for diverting unfit meat back into the food chain.

Defendants were convicted earlier this year following an investigation by Southwark Council and the Food Standards Agency’s (FSA) National Food Crime Unit (NFCU).

The USDA’s Food Safety and Inspection Service has issued a rule to change post-mortem (after death) inspection requirements for swine slaughter establishments “to remove mandatory mandibular lymph node incision and viscera palpation requirements in both traditional and New Swine Inspection System (NSIS) establishments.”

Researchers looking at the impact of the COVID-19 pandemic have revealed major differences between how countries monitor infections.

The study emphasized the substantial differences in transmission routes, surveillance, notification and detection methods, as well as testing and sampling practices of selected diseases across six countries.

There is a low rate of bacterial contamination in frozen berries, according to a study in Switzerland.

However, researchers warned that such products may pose a risk if they are consumed without a heating step and not immediately after thawing.